brown period

my last period was 4 days long and it was just brown.

i’ve had this before a few years ago but this was short, it wasnt heavy either. i didnt get any proper symptoms, just ate loads and was really tired. no cramps. i havent had sex so its not anything to do with pregnancy, but what could this mean?

i have tried researching it but found nothing on a brown period, just brown spotting.

should i see a doctor? i dont usually have any issues with my periods